Crucible.



ATTORNEY wa g PATENTED JAN. 8, 1907.

UNITED STATES PATEN EroE.

EDWARD AfooLsr, or NEWARK, NEW JERSEY.

CRUCIBLE.

its. 840,826.

Specification of Letters Patent.

Patented Jan. 8, 1907.

A li ati n fil d November 23, 1905. Renewed October 9. 1906. Serial No.338,170.

To alt whom it mag/concern:

' Be it known that I, EDWARD A. COLBY, a

citizen of the United States, residing at Newark, in the county of Essexand State of New Jersey, have'invented a certain new and useiulImprovement in Crucibles, of which the following is a specification.

The invention relates to electrical induction-furnaces for meltingmetals, wherein the charge forms a closed secondary circuit which isdisposed in inductive relation to a primary coil, so that the currentsinduced in said charge operate'to melt the same.

The invention consists in a crucible formed of sections connected bykeys; also, in the va rious combinations set forth in the claims.

. In the accompanying drawings, Figure 1 is a top view ofthe crucible.Fig. 2 is a perspective view of a portion of the upper rim, showing thekeyways. Fig. 3 shows one of the keys separately. Fig. 4 is a face viewof one of the joints between the crucible-sections. Fig. 5 is anenlarged cross-section on the line so as of Fig. 1.

Similar letters of reference indicate like parts.

The crucible Ais annular in form and is composed of a number ofarc-shaped sections, as B, which are placed together.

connect the sections, I provide inthe vertical edge of each sectionkeyways, as G and D,

of dovetail form. When the; sections are brought together'edge to edge,the keyway C D of one section, as B, Fig. 2, meet thekeyways E F of thenext section G, thus forming I double dovetail keyways, in which fitkeys H; of refractory material. The keys thus hold the sections closelytogether at. their approximating vertical edges. In order to preventvertical displacement of the sections, I also form in each section atransverse keyway I, extending at right angles to the keyways C D. Whenthe sections are brought together, j

the meeting keyways I form a .keyway of double dovetail form, thedovetails being one abovetheother. Into the double dovetail i keywaythus made is inserted a key J, similar 7 to H, as shown in Fig. 4-." Ithus constructa In order to crucible of sections without the use of any-1. A-crucible formed of arc-shaped/ sections having dovetailedkeywaysin their approidm'atin'g edges and keys constructed to fit-insaidkeyways. f I Q 2. A crucible formed of arc-shaped sections havingdovetail keywaysparallel to the central axis of said crucible in theirapproximating edges and keys constructed to' fit in said keyways.

3. A crucible formed of arc-shaped sections having dovetailed keyways atright an gles to the central axis of said crucible, in theirapproximating edges and keys constructed to fit in said keyways.

4. A crucible formed of arc-shaped sections having in theirapproximating edges dovetail keyways. parallel to the axisof saidcrucible and dovetail keyways at right angles to said first-namedkeyways and keys constructed to fit insaid keyways.

5. An annular crucible formed of sections having in their approximatingedges dovetail. keyways and keys constructed to fit in said keyways.-

6. As a new. article of manufacture and After the sections have sale, anarc-shaped crucible-section having two parallel walls, and in the edgesof; said walls dovetail keyways disposed relatively at right angles.

In testimony wheredf I have aflixed my signature in presence oftwowitnesses. l

-- I -.EDWARD A. COLBY.

Witnesses:

' PARK BENJAMIN, Jr.,

; WM. H. SIEGMAN.

